After a months-long delay, the tax bills are now available online with payment due by October 1, 2026. Cook County homeowners can find their bills on...
the Cook County Treasurer's office website using the property PIN or address. Paper bills should be mailed around September 1.
Normally, these bills are mailed in early July and due August 1. This year (2026), Cook County officials say property owners will have until October 1 to make their second-installment payment for 2025. (Because Illinois property taxes are paid in arrears, 2025 taxes are paid in 2026.)The delay stems from ongoing problems with the county's new property tax system, which has pushed back the preparation and mailing of the bills.
Buying or selling real estate while tax bills are delayed? You might pay more attention to property tax prorations. When the current bill isn't available, buyers and sellers typically rely on estimated prorations, making it even more important to understand how those numbers are calculated before closing.
To learn more, check out this quick video about paying property taxes at closing.
Schedule a call with Mike (me) to learn more about buying and selling real estate in the Chicago area.